There is a bit of info on the bottom saying that if the weather looks as if there is the likelyhood of day birds from Barcelona then they will liberate the birds as early as poss to avoid any "Night Flight" birds.

Not alot
Still I can't explain the buzz you get clocking a pigeon from the Biggest pigeon race in the world knowing it has been liberated with pigeons from France, Belgium, Germany, Holland, Luxembourg & Poland. now thats what you call Drag!

Taking into account the weather forecast for today and coming days we've Decided to release the birds today, Friday, however at a later time. This decision was made together with the (inter) national sports committee chairmen and Those in charge of the liberation. The exact hour of liberation will be announced later today on Cureghem Centre's website.